package com.health.system.springSecurity;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;

/**
 * <p>Title: 访问权限过滤器 </p> 
 * Description: </p>
 * Copyright: Copyright (c) 2011-03 
 * Company: 
 * 
 * @author 
 * @version 1.0 
*/

public class MyFilter extends AbstractSecurityInterceptor implements Filter {

	private FilterInvocationSecurityMetadataSource filterInvocationSecurityMetadataSource;

	/**
	 * 
	 * @param request
	 * @param response
	 * @param chain
	 * @throws IOException
	 * @throws ServletException
	 */
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest httpRequest = (HttpServletRequest) request;
		FilterInvocation filterInvocation = new FilterInvocation(request,
				response, chain);
		invoke(filterInvocation);
	}

	public Class<? extends Object> getSecureObjectClass() {
		return FilterInvocation.class;
	}

	public void invoke(FilterInvocation filterInvocation) throws IOException,
			ServletException {
		InterceptorStatusToken token = super.beforeInvocation(filterInvocation);
		try {
			filterInvocation.getChain().doFilter(filterInvocation.getRequest(),
					filterInvocation.getResponse());
		} finally {
			super.afterInvocation(token, null);
		}
	}

	public SecurityMetadataSource obtainSecurityMetadataSource() {
		return this.filterInvocationSecurityMetadataSource;
	}

	public void destroy() {
	}

	public void init(FilterConfig arg0) throws ServletException {
	}

	public FilterInvocationSecurityMetadataSource getFilterInvocationSecurityMetadataSource() {
		return filterInvocationSecurityMetadataSource;
	}

	public void setFilterInvocationSecurityMetadataSource(
			FilterInvocationSecurityMetadataSource filterInvocationSecurityMetadataSource) {
		this.filterInvocationSecurityMetadataSource = filterInvocationSecurityMetadataSource;
	}

}